You can use the firewall and masquerading on any linux system, as long
the kernel supports firewalling/masquerading and the tool ipfwadm
is available.
You may get errors when while installing the rpm, cause a script to
include the default settings into /erc/rc.config is called
during the installation. Ignore this error and move the file
/var/adm/fillup-templates/rc.config.firewall to
/etc/rc.config.
Depending on the distribution you are using, it may also be neccesary
to call the two script /sbin/init.d/firewall and
/sbin/init.d/firewall during the boot process out of
/etc/rc.d/something.